Yellow Bullet Forums banner

1 - 20 of 22 Posts

·
Registered
Joined
·
677 Posts
Discussion Starter #1
My fuel pressure is set at 7lbs at my gauge on the cowl. It was set at 1500 rpms as per Magnafuel. While running, whether it's racing, street driving or just idling the pressure will drop below 4lbs.
Description of the system:
Aluminum fuel cell
#12 line from cell to pump
Magnafuel 500 filter and pump unit
#10 line to Magnafuel log and regulators
#6 line going to the carb and plate.
Power comes from twin relays mounted near the battery next to the pump
so there's no volt or amp loss.
Autometer Procomp liquid filled gauge.
I've double/triplle checked everything I can think of.
Any ideas would be appreciated.

Thank you - Steve
 

·
Registered
Joined
·
5,680 Posts
Are you running pump gas with foam in the cell ? Dirty filter ? Old pump ?
 

·
Registered
Joined
·
677 Posts
Discussion Starter #7
#8 vent, Filter looks clean, not a spec, Race fuel with foam in the cell, I was thinking may gauge but the car feels flat as the pressure drops.
 

·
Registered
Joined
·
5,053 Posts
Might try the guage,just went through this.Replaced,pump,lines and other stuff to find out that 2 guages were bad.A new guage and my old one.They did fine till bout 3 min of running time and started to creep down to 4# and lower.
 

·
TEAM CARB
Joined
·
45,231 Posts
theres usually a rubber plug on the back...drain a little glycol or air out...needle should move...
They can move from heat.. it may have been wrong when you set it...
This goes for any liquid filled gauge that sees heat...
 

·
Registered
Joined
·
677 Posts
Discussion Starter #17
theres usually a rubber plug on the back...drain a little glycol or air out...needle should move...
They can move from heat.. it may have been wrong when you set it...
This goes for any liquid filled gauge that sees heat...
I'll try that too. Thanks
 

·
Bracket racer
Joined
·
13,292 Posts
Liquid filled gauge is my bet. Change that and I bet you'll find your problem.
 
1 - 20 of 22 Posts
Top